Handle empty requests for ping, add a bit of styling

tapas/handler.py

@@ -15,6 +15,8 @@ def handle(req):
         "author": "bat",
     }
     """
+    if not req:
+        return "Foo", 200, {"Content-Type": "text/plain"}
     try:
         args = loads(req)
     except Exception:
@@ -25,7 +27,7 @@ def handle(req):
     c.image.save(byte_arr, format="JPEG")
 
     return (
-        f'<img src="data:image/jpeg;base64, {base64.b64encode(byte_arr.getvalue()).decode("utf-8")}">',
+        f'<img src="data:image/jpeg;base64, {base64.b64encode(byte_arr.getvalue()).decode("utf-8")}" style="width: 100%; border: solid 1px #aaa;">',
         200,
         {"Content-Type": "text/html"},
     )